string CartellaFileAppoggio = Path.Combine(ConfigurationSettings.AppSettings["pathFile"], FILE_NAME);
            using (FileStream fs = new FileStream(CartellaFileAppoggio, FileMode.Open, FileAccess.ReadWrite, FileShare.None))
            {
                using (StreamWriter sw = new StreamWriter(fs))
                {
                    sw.WriteLine("scrittura 1");
                    sw.Close();
                }
            }
            
            using (FileStream fs = new FileStream(CartellaFileAppoggio, FileMode.Open, FileAccess.ReadWrite, FileShare.None))
            {
                using (StreamReader sr = new StreamReader(fs))
                {
                    string lettura = sr.ReadLine();
                    sr.Close();
                }
              
            }